EP2389171B1 - Verwendung von pterosinverbindungen zur behandlung von diabetes und adipositas - Google Patents

Verwendung von pterosinverbindungen zur behandlung von diabetes und adipositas Download PDF

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EP2389171B1
EP2389171B1 EP10734012.7A EP10734012A EP2389171B1 EP 2389171 B1 EP2389171 B1 EP 2389171B1 EP 10734012 A EP10734012 A EP 10734012A EP 2389171 B1 EP2389171 B1 EP 2389171B1
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compound
pterosin
mice
glucose
compounds
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EP2389171A4 (de
EP2389171A2 (de
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Feng-Lin Hsu
Shing-Hwa Liu
Biing-Juan Uang
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National Tsing Hua University NTHU
National Taiwan University NTU
Taipei Medical University TMU
DCB USA LLC
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National Tsing Hua University NTHU
National Taiwan University NTU
Taipei Medical University TMU
DCB USA LLC
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/7028—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages
    • A61K31/7034—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages attached to a carbocyclic compound, e.g. phloridzin
    • A61K31/704—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages attached to a carbocyclic compound, e.g. phloridzin attached to a condensed carbocyclic ring system, e.g. sennosides, thiocolchicosides, escin, daunorubicin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/12—Ketones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/045—Hydroxy compounds, e.g. alcohols; Salts thereof, e.g. alcoholates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/045—Hydroxy compounds, e.g. alcohols; Salts thereof, e.g. alcoholates
    • A61K31/047—Hydroxy compounds, e.g. alcohols; Salts thereof, e.g. alcoholates having two or more hydroxy groups, e.g. sorbitol
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/12—Ketones
    • A61K31/122—Ketones having the oxygen directly attached to a ring, e.g. quinones, vitamin K1, anthralin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/185—Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic orย hydroximic acids
    • A61K31/19—Carboxylic acids, e.g. valproic acid
    • A61K31/192—Carboxylic acids, e.g. valproic acid having aromatic groups, e.g. sulindac, 2-aryl-propionic acids, ethacrynic acidย 
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/21—Esters, e.g. nitroglycerine, selenocyanates
    • A61K31/215—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids
    • A61K31/216—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids of acids having aromatic rings, e.g. benactizyne, clofibrate
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/335—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin
    • A61K31/365—Lactones
    • A61K31/366—Lactones having six-membered rings, e.g. delta-lactones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
    • A61K31/403—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil condensed with carbocyclic rings, e.g. carbazole
    • A61K31/404—Indoles, e.g. pindolol
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/7028—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages
    • A61K31/7034—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages attached to a carbocyclic compound, e.g. phloridzin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K36/00—Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K36/00—Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
    • A61K36/11—Pteridophyta or Filicophyta (ferns)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/04—Anorexiants; Antiobesity agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/06—Antihyperlipidemics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
    • A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics

Definitions

  • Pterosin compounds are sesquiterpenoids existed in Bracken. Some members of this family are found to possess antineoplastic activity as previously described in, for example, Japan Pat. No. 63146839A2 , Chem. Pharm. Bull. 1978, 26, 2346 , Molecules 2008, 13, 255 .
  • Diabetes a disorder of sugar metabolism, is characterized by abnormally high blood glucose levels.
  • diabetes There are two different types of diabetes, namely the non-insulin-dependent or maturity onset form, also known as type 2; and the insulin-dependent or juvenile onset form, also known as type 1.
  • Type 2 diabetes usually occurs in adults and is highly associated with obesity. Type 2 diabetic patients must control their diet and are encouraged to lose weight and to exercise. They take medicine that increase insulin sensitivity or stimulate the pancreas to release insulin. Current drugs for type 2 diabetes include sulfonylureas, meglitinides, biguanides, thiazolinediones, and โ‡ -glycosidase inhibitors, which however have a number of limitations, such as adverse effects and high rates of secondary failure. In contrast, type 1 diabetic patients are not over-weight relative to their age and height, and exhibit a rapid onset of the disease at an early age. Type 1 diabetic patients must administer insulin by injection for their entire life time. Although there has been much research on oral administration of insulin, no successful oral dosage of insulin is marketed at present.
  • US Patent No. 2006/111445A1 discloses some idane compounds that have been found to have a hypolipidaemic and hypoglycaemic effect.
  • the present invention is based on the unexpected finding that a number of pterosin compounds possess anti-diabetic and anti-obesity activities.
  • this invention provides a pterosin compound for use in treating diabetes or obesity in a subject, wherein the pterosin compound is one of Compounds 1, 4, 5, 7, 17, 52, 63 and 72-74 as follows:
  • the present invention is directed a pterosin compound for use in treating diabetes or obesity, wherein the pterosin compound is one of Compounds 1, 4, 5, 7, 17, 52, 63 and 72-74 as follows:
  • the pterosin compounds described herein include the compounds themselves, as well as their salts and solvates, if applicable.
  • a salt for example, can be formed between an anion and a positively charged group (e.g., amino) on a pterosin compound.
  • Suitable anions include chloride, bromide, iodide, sulfate, nitrate, phosphate, citrate, methanesulfonate, trifluoroacetate, acetate, malate, tosylate, tartrate, fumurate, glutamate, glucuronate, lactate, glutarate, and maleate.
  • a salt can also be formed between a cation and a negatively charged group (e.g., carboxylate) on a pterosin compound.
  • Suitable cations include sodium ion, potassium ion, magnesium ion, calcium ion, and an ammonium cation such as tetramethylammonium ion.
  • the pterosin compounds also include those salts containing quaternary nitrogen atoms.
  • a solvate refers to a complex formed between an active pterosin compound and a pharmaceutically acceptable solvent. Examples of pharmaceutically acceptable solvents include water, ethanol, isopropanol, ethyl acetate, acetic acid, and ethanolamine.
  • the pterosin compounds as used in this invention can be in an isolated form, i.e., prepared by a synthetic method or enriched from a natural source, e.g., Bracken, such as Dennstaedtiaceae and Pteridaceae.
  • a natural source e.g., Bracken
  • Dennstaedtiaceae and Pteridaceae include Dennstaedtia scandens, Histiopteris incisa, Microlepia speluncae, Pteridium aquilinum var. latiusculum, Pteridium revolutum, Hypolepis punctata, Ceratopteris thalictroides, Pteris fauriei, Pteris dimidiata, and Pteris ensiformis.
  • pterosin compounds described herein are naturally occurring and therefore can be isolated from the natural sources.
  • An isolated pterosin compound refers to a preparation that contains at least 40% of the compound by dry weight. Purity of an isolated compound can be measured by, e.g., column chromatography, mass spectrometry, high performance liquid chromatography (HPLC), NMR, or any other suitable methods.
  • Non-naturally occurring pterosin compounds can be either converted from those that are naturally-occurring (see, e.g., Banerji er al, Tetrahedron Latters, 1974, 15, 1369 , Hayashi et al., Tetrahedron Letters, 1991, 33, 2509 , and McMorris et al., J. Org. Chem., 1992, 57, 6876 ), or synthesized de novo by methods well known in the art.
  • Synthetic chemistry transformations and protecting group methodologies useful in synthesizing the desirable pterosin compounds are known in the art, for example, those described in R. Larock, Comprehensive Organic Transformations, VCH Publishers (1989 ); T.W. Greene and P.G.M. Wuts, Protective Groups in Organic Synthesis, 3rd Ed., John Wiley and Sons (1999 ); L. Fieser and M. Fieser, Fieser and Fieser's Reagents for Organic Synthesis, John Wiley and Sons (1994 ); and L. Paquette, ed., Encyclopedia of Reagents for Organic Synthesis, John Wiley and Sons (1995 ) and subsequent editions thereof.
  • a pterosin compound thus synthesized can be isolated from the reaction mixture with a suitable solvent, and optionally, further purified by flash column chromatography, high performance liquid chromatography, crystallization, or any other suitable methods.
  • the pterosin compounds mentioned herein may contain a non-aromatic double bond and one or more asymmetric centers. Thus, they can occur as racemates and racemic mixtures, single enantiomers, individual diastereomers, diastereomeric mixtures, and cis- or trans- isomeric forms. All such isomeric forms are contemplated.
  • the pterosin compounds can also be present in a fern product prepared from Bracken such as Dennstaedtiaceae and Pteridaceae.
  • a fern product prepared from Bracken such as Dennstaedtiaceae and Pteridaceae.
  • Certain examples of these plants include Dennstaedtia scandens, Histiopteris incisa, Microlepia speluncae, Pteridium aquilinum var. latiusculum, Pteridium revolutum, Hypolepis punctata, Ceratopteris thalictroides, Pteris fauriei, Pteris dimidiata, and Pteris ensiformis.
  • the fern product as described herein refers to any product from at least one of the plant of the above-identified species per se, its part(s), such as leaves, flowers, roots, seeds, stems and fruits, or any modified forms thereof such as juice, powders, granules, extracts, slices, concentrates, and precipitates. Specifically, the fern product is from the fresh whole plant.
  • a fern product of Bracken as described herein can be prepared by any standard method or techniques commonly known in the art. One example of the preparation of the fern is described below.
  • This residue is dissolved in distilled water and then extracted successively with n -hexane and ethyl acetate to provide a n -hexane soluble fraction, an ethyl acetate soluble fraction and a water soluble fraction.
  • the organic soluble fraction is subjected to polydextran gel (Sephadex LH-20), high-porous polystyrene gel (Diaion HP-20, MCI CHP-20P) gel column chromatography (CC) eluting with water-methanol, ethanol or purified by silica gel CC with n-hexane, benzene, dichloromethane and methanol solvent system.
  • the structures of purified compound can be confirmed by nuclear magnetic resonance (NMR) and mass spectrum (MS) spectra analyses and physical data.
  • the pterosin Compounds 1, 4, 5, 7, 17, 52, 63 and 72-74 are effective in treating diabetes including type I and type II.
  • type I diabetes As used herein, the term "type I diabetes", "juvenile onset diabetesโ€ or โ€œinsulin-dependent diabetesโ€ refer to the disease characterized by the pancreas making too little or no insulin. Patients afflicted with type I diabetes depend on insulin for survival; namely without insulin, the patients develop sever metabolic complications, such as acute ketoacidosis and coma.
  • type II diabetes As used herein, the term "type II diabetes", โ€œmaturity onset diabetesโ€ or โ€œnon-insulin-dependent diabetesโ€ refers to the disease characterized by excess glucose production in spite of the availability of insulin, and circulating glucose levels remain excessively high as a result of inadequate glucose clearance.
  • a "subjectโ€ is particularly a mammal, such as a human, but can also be a companion animal (e.g., dogs, cats, and the like), farm animals (e.g., cows, sheep, pigs, horses, and the like) or laboratory animals (e.g., rats, mice, guinea pigs, and the like) in need of the treatment as described.
  • the subject is obese.
  • treating includes prophylaxis of the specific disorder or condition, or alleviation of the symptoms associated with a specific disorder or condition and/or preventing or eliminating said symptoms.
  • treating diabetes will refer in general to reducing glucose levels, improving insulin sensitivity, or increasing glucose consumption.
  • an effective amount refers to the amount of each active agent required to confer therapeutic effect on the subject, either alone or in combination with one or more other active agents. Effective amounts vary, as recognized by those skilled in the art, depending on route of administration, excipient usage, and co-usage with other active agents.
  • the peterosin compounds are orally administered in an amount from 10 to 250 mg/kg, specifically 25 to 200 mg/kg, more specifically 50 to 150 mg/kg, and most specifically 100 mg/kg.
  • the peterosin compounds are administered via subcutaneous injection, intraperitoneal injection, intramuscular injection or intravenous injection in an amount from 5 to 150 mg/kg, specifically 10 to 100 mg/kg, more specifically 20 to 80 mg/kg, and most specifically 30 mg/kg.
  • one or more of the peterosin compounds described herein can be mixed with a pharmaceutically acceptable carrier to form a pharmaceutical composition.
  • a pharmaceutically acceptable carrier means that the carrier must be compatible with the active ingredient of the composition (and preferably, capable of stabilizing the active ingredient) and not deleterious to the subject to be treated.
  • Solubilizing agents such as cyclodextrins (which form specific, more soluble complexes with one or more of active compounds of the extract), can be utilized as pharmaceutical excipients for delivery of the active compounds.
  • examples of other carriers include colloidal silicon dioxide, magnesium stearate, cellulose, sodium lauryl sulfate, and D&C Yellow # 10.
  • the pharmaceutical composition can be administered orally or parenterally.
  • parenteral includes subcutaneous, intracutaneous, intravenous, intramuscular, intraarticular, intraarterial, intrasynovial, intrasternal, intrathecal, intralesional and intracranial injection or infusion techniques.
  • a sterile injectable composition e.g., aqueous or oleaginous suspension
  • a sterile injectable composition can be formulated according to techniques known in the art using suitable dispersing or wetting agents (such as, for example, Tween 80) and suspending agents.
  • the sterile injectable preparation can also be a sterile injectable solution or suspension in a non-toxic parenterally acceptable diluent or solvent, for example, as a solution in 1,3-butanediol.
  • suitable vehicles and solvents that can be employed are mannitol, water, Ringer's solution and isotonic sodium chloride solution.
  • sterile, fixed oils are conventionally employed as a solvent or suspending medium (e.g., synthetic mono- or di-glycerides).
  • Fatty acids such as oleic acid, are useful in the preparation of injectables, as are natural pharmaceutically-acceptable oils, such as olive oil or castor oil, especially in their polyoxyethylated versions.
  • These oil solutions or suspensions can also contain a long-chain alcohol diluent or dispersant, or carboxymethyl cellulose or similar dispersing agents.
  • An oral composition can be any orally acceptable dosage form including, but not limited to, tablets, capsules, emulsions and aqueous suspensions, dispersions and solutions.
  • Commonly used carriers for tablets include lactose and corn starch.
  • Lubricating agents, such as magnesium stearate, are also typically added to tablets.
  • useful diluents include lactose and dried corn starch.
  • the present invention is also based on the unexpected finding that the pterosin Compounds 1, 4, 5, 7, 17, 52, 63 and 72-74 as described exhibit anti-obesity activities.
  • the present invention is further directed to a pterosin compound for use in treating obesity, wherein the pterosin compound is one of Compounds 1, 4, 5, 7, 17, 52, 63 and 72-74 according to the invention.
  • the use according to the invention may reduce the serum lipid (e.g. triglycerides) or cholesterol levels in a subject.
  • serum lipid e.g. triglycerides
  • Suitable in vitro assays can be used to preliminarily evaluate the efficacy of a pterosin compound in treating diabetes and obesity.
  • the compound can further be examined for its efficacy in treating diabetes and obesity in vivo.
  • the compound can be administered to an animal having diabetes or obesity (e.g., an animal model induced by a chemical, genetic mutation or high fat food to develop diabetes or obesity) and its therapeutic effects are then accessed. Based on the results, an appropriate dosage range and administration route can also be determined.
  • Hypolepis punctata (Thunb.) Mett. was collected from Wulai Township, Taipei County. Fresh whole plant (11 kg) of Hypolepis punctata was extracted with MeOH (20 L) thee times at room temperature to yield a MeOH extract, which was partitioned between n -hexane-H 2 O (1:1) (1.5 L x 3) to provide a n -hexane soluble fraction and a H 2 O soluble fraction. The H 2 O soluble fraction was partitioned between EtOAc-H 2 O (1:1) (1.5 L x 3) to provide an EtOAc soluble fraction and a H 2 O soluble fraction.
  • Fraction 3-2 was applied to silica gel CC, developed with CH 2 Cl 2 -MeOH (9:1) to obtain pterosin Z (790 mg).
  • Fraction 3-4 was subjected to silica gel CC, eluting with EtOAc-n-Hexane (4:1) to give pterosin I (24 mg).
  • Fraction 4 was applied to Sephadex LH-20 gel CC eluting with MeOH to afford 2 fractions.
  • Frection 4-1 was purified by MCI CHP-20P gel CC (H 2 O โ‡ MeOH) and Silica gel CC with EtOA-n-Hexane (7:3) to obtain pterosin D (20 mg).
  • Pteridium revotulum (BI.) Nakai was collected from Mt. Datun, Taipei City. At room temperature, fresh whole plant of Pteridium revotulum (BI.) Nakai (20 kg) was extracted with MeOH (20 L x3) to yield a MeOH extract, after evaporate organic solvent the extract was subjected to Celite CC sequent elute with n-hexane, CH 2 Cl 2 and MeOH to afford 3 fractions. The CH 2 Cl 2 soluble fraction was subjected to MCI CHP-20P gel CC eluting with H 2 O and MeOH (1:1 โ‡ 0:1) to furnish 3 fractions.
  • Fraction 1 was purified by silica gel CC and eluting with CH 2 Cl 2 and MeOH (14:1) to give fractions 1-1 โ‡ 1-3.
  • Fraction 1-2 was purified by silica gel CC eluting with n-hexane-EtOAc (1:2) and ODS gel CC with CH 3 CN: H 2 O (1:9) to produce (3R)-pterosin X (2.2 mg) and (2)- hydroxypterosin C (4.3 mg).
  • STZ-induced diabetic mice were administered orally with Compound 1 (50 mg/kg).
  • STZ-induced diabetic mice are a well-known mouse model of type I diabetes (insulin dependent). See, e.g., Liu IM, et al., Neuroscience Letters 2001; 307: 81-84 .
  • mice Two hours later, normal mice, STZ-induced diabetic mice, and the Compound 1-treated STZ-mice as described were subjected to a glucose tolerance assay. Briefly, all of the mice were orally administered with 1 g/kg glucose and the blood glucose levels of these mice were examined at 30, 60, 90, 120 and 150 minutes. In the normal and STZ-diabetic mice, the blood glucose levels elevated 30 minutes after uptake of glucose. Surprisingly, in Compound 1-treated STZ-diabetic mice, the blood glucose levels were increased only slightly at 30 minute after glucose uptake and were significantly lowered 60 minutes after glucose uptake.
  • STZ-induced diabetic mice were treated with Compound 1 orally (100 mg/kg) for 14 days. These mice were then orally administered with glucose at a dose of 2 g/kg. Their blood glucose levels were examined 15, 45, 75, and 105 minutes after glucose administration. Fig.1 shows the results.
  • results thus obtained indicate that the blood glucose levels in health control mice, STZ-induced diabetic mice, and Compound 1 treated STZ-induced diabetic mice were increased 15 minutes after glucose administration.
  • the blood glucose levels in these treated mice were close to those of health control mice. Accordingly, the results described herein indicate that Compound 1 significantly lowered blood glucose levels in STZ-induced diabetic mice.
  • Other pterosin compounds of the invention, including Compounds 7, 72, 73, 74 were also demonstrated to have the same effect in this assay.
  • Differentiated C 2 C 12 mycrotubes (American Type Culture Collection: ATCC) were used to conduct an insulin sensitivity assay, which was performed based on the method as described in Experimental and Molecular Medicine, Vol. 39, No. 2, 222-229, 2007 . Briefly, the cells were incubated with different concentrations of Compound 1 in the presence of insulin 100 nM, and then the glucose uptake was measured.
  • AMPK activator AICAR (5-amino-4-carboxamide imidazole riboside 5'-phosphate, 1 โ‡ M) was used as a positive control.
  • Fig.2 shows the results.
  • C 2 C 12 mycrotubes (American Type Culture Collection: ATCC) were used to conduct a glucose consumption/uptake assay, which was performed based on the method as described in Experimental and Molecular Medicine, Vol. 39, No. 2, 222-229, 2007 . Briefly, the C 2 C 12 cells were pretreated with 0.5 โ‡ Ci [ 14 C]2-DG for 20 min and then incubated with compounds for 1 hour to determine glucose uptake by radio activity. All values are expressed as the means โ‡ S.E. of three experiments. Fig.3 shows the results.
  • GLUT4 plays an important role in insulin-induced glucose uptake to maintain normal blood glucose levels.
  • STZ-induced diabetic mice were treated with Compound 1 orally (100 mg/kg) for 14 days; and then normal mice, STZ-induced diabetic, and the Compound 1 -treated STZ-mice as described were analyzed for the Glut4 expression in soleus muscles based on the method as described in Biochem J. 1996; 313(Pt 1): 133-140 ). Briefly, at the end of the experimental period, animals were sacrificed by exsanguinations under diethyl ether anesthesia. Soleus muscles from each animal were excised and weighed. The soleus muscles were homogenized in lysis buffer and centrifugation, and then went to determine the GLUT4 protein expression by western blot analysis. Fig.4 shows the results.
  • the results described herein indicate that Compound 1 significantly rescued the redistribution of Glut4 (glucose transporter-4, the insulin-regulated glucose transporter) into the cell membrane of soleus muscles in STZ-induced diabetic mice.
  • Other pterosin compounds of the invention including Compounds 5, 7, 72, 73, 74 were also demonstrated to have the same effect.
  • the results suggest that the pterosin compounds of the invention may activate Glut4 and in turn reduce the blood glucose in diabetic mice.
  • PEPCK is known as a key enzyme that controls gluconeogenesis in the liver.
  • STZ-induced diabetic mice were treated with Compound 1 orally (100 mg/kg) for 14 days, and then normal mice, STZ-induced diabetic, and the Compound 1-treated STZ-mice described above were analyzed for the PEPCK mRNA expression in liver based on the method as described in Bulletin of Experimental Biology and Medicine 1979;87: 568-571 . Briefly, at the end of the experimental period, animals were sacrificed by exsanguinations under diethyl ether anesthesia. Livers from each animal were excised and weighed. The liver homogenates were prepared to determine the PEPCK mRNA expression by RT-PCR analysis. Fig. 5 shows the results.
  • Insulin-resistant C57BL/6J-Leprdb/Lepr db (hereafter, db/db) mice are a well-known mouse model of type II diabetes. See, e.g., Metabolism. 2000; 49:22-31 ).
  • the db/db mice (Jackson Laboratory) were orally administered with Compound 1 (100 mg/kg/day) for 28 days, or administered with Compound 1 (30 mg/kg/day) via intraperitoneal (i.p.) injection for 21 days or 28 days.
  • i.p. intraperitoneal
  • Two hours later, normal mice, db/db-mice, and the Compound 1 -treated db/db-mice were subjected to a glucose tolerance assay as described in Example 1.
  • Figs. 6 to 8 show the results.
  • haemoglobin A1C or HbA1C In the blood stream, glucose sticks to the haemoglobin to form a "glycosylated haemoglobin" molecule, called haemoglobin A1C or HbA1C.
  • haemoglobin A1C or HbA1C The more glucose in the blood, the more haemoglobin A1C or HbA1C will be present in the blood.
  • the HbA1C test is currently one of the common ways to check if diabetes is under control. See, e.g. Diabetes Care. 2001;24:465-471 .
  • mice Jackson Laboratory
  • Compound 1 100 mg/kg/day
  • normal mice, db/db-mice, and the Compound 1-treated db/db-mice were subjected to a HbA1C test, which was conducted based on a method as described in Life Sci. 2005;77:1391-403 .
  • animals were sacrificed by exsanguinations under diethyl ether anesthesia. Plasma was separated from the blood by centrifugation. HbAlc in blood was measured by the standardized method.
  • Fig.9 shows the results.
  • mice Jackson Laboratory
  • Compound 1 100 mg/kg/day
  • normal mice, db/db-mice, and the Compound 1 -treated db/db-mice were subjected to a HOMA-IR test, which was conducted based on a method as described in Biol. Pharm. Bull. 2007;30:2196-2200 .
  • mouse insulin enzyme immunoassay ELISA kit was used to measure the plasma insulin concentration. Insulin resistance was determined by the homeostasis model assessment (HOMA) method.
  • Fig.10 shows the results.
  • Results thus obtained indicate that Compound 1 significantly reduced the HOMA-IR levels in db/db-mice.
  • Other pterosin compounds of the invention, including Compounds 7 and 73 were also demonstrated to have the same effect in this assay.
  • AMP-activated protein kinase is an important sentinel for energy metabolism, which can be activated by low AMP/ATP ratio, exercise, hypoxia and nutrient starvation. Phosphorylation of Thr 172 may lead to activation of AMPK, which in turn activates down-stream effectors including acetyl CoA carboxylase, HMG CoA reductase, GLUT-4, glucose-6 phosphatase and PEPCK and regulate fatty acid โ‡ -oxidation, cholesterol synthesis, glucose transport, and gluconeogenesis, respectively.
  • AMPK may be considered as a molecular target for metabolic syndrome and type II diabetes.
  • the compounds of the invention may activate AMPK, which in turn regulate insulin regulation of carbohydrate (see the glucose consumption/uptake assay as described in Example 4) and fatty acid metabolism (see Example 12 below), and can be considered as a potential anti-diabetic and antiobesity agent.
  • High fat-diet fed mice as a type 2 diabetic model were prepared based on the method as previously described in Diabetes 53 (Suppl. 3):S215-S219, 2004 ). In this study, mice were fed with a high-fat diet (TestDiet, Richmond, IN, USA; fat content 60% kcal) for 8 weeks to induce type 2 diabetes.
  • a high-fat diet TeestDiet, Richmond, IN, USA; fat content 60% kcal
  • HFD mice were treated with Compound 1 orally (100 mg/kg) for 28 days; and then normal mice, HFD mice, and the Compound 1 -treated HFD mice were analyzed for the levels of serum lipids, including total cholesterol, triglyceride, high-density lipoprotein (HDL)-cholesterol, and low-density lipoprotein (LDL)-cholesterol by ELISA kits.
  • Fig .12A shows the results.
  • Fig.12B shows the ratios of HDL-cholesterol/total cholesterol and LDL-cholesterol/ total cholesterol.
  • Results thus obtained indicate that Compound 1 significantly reduced serum lipids and exhibited anti-obesity effects in HFD mice.

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Claims (7)

  1. Pterosin Verbindung zur Verwendung bei der Behandlung von Diabetes oder Adipositas bei einem Patienten, wobei die Verbindung eine der folgenden Verbindungen 1, 4, 5, 7, 17, 52, 63 und 72 bis 74 ist:
    Figure imgb0026
    Figure imgb0027
    Figure imgb0028
    Figure imgb0029
    Figure imgb0030
     wobei
    Glu Glucose, 4-cou-glu 4-O-p-Coumaroyl-D-Glucose und 6-cou-glu 6-O-p-Coumaroyl-D-Glucose ist.
  2. Verbindung zur Verwendung nach Anspruch 1, wobei die Verbindung oral oder mittels Injektion verabreicht wird.
  3. Verbindung zur Verwendung nach Anspruch 1 oder 2, wobei der Patient adipรถs ist.
  4. Verbindung zur Verwendung nach einem der Ansprรผche 1 bis 3, wobei die Pterosin Verbindung eine isolierte Pterosin Verbindung ist.
  5. Verbindung zur Verwendung nach einem der Ansprรผche 1 bis 4, wobei die Pterosin Verbindung isoliert wurde aus Adlerfarn des Dennstaedtiaceae oder Pteridaceae.
  6. Verbindung zu Verwendung nach Anspruch 5, wobei der Adlerfarn ausgewรคhlt wird aus der Gruppe bestehend aus Dennstaedtia scandens, Histiopteris incisa, Microlepia speluncae, Pteridium aquilinum var. latiusculum, Pteridium revolutum, Hypalepis punctata, Ceratopteris thalictroides, Pteris fauriei, Pteris dimidiata und Pteris ensiformis.
  7. Verbindung zur Verwendung nach einem der Ansprรผche 1 bis 6, wobei die Verbindung ausreichend ist, um die Konzentration Level des Blutfetts oder Cholesterols im Patienten zu senken.
EP10734012.7A 2009-01-26 2010-01-26 Verwendung von pterosinverbindungen zur behandlung von diabetes und adipositas Not-in-force EP2389171B1 (de)

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